FAQ

About the product

What is Mosaic in one sentence? An ERC-4626 vault that turns one USDG deposit into a diversified lending position, rebalanced only when moving is worth the gas.

How do I earn? Your shares become worth more USDG. There is no claim button, no reward token, and no separate harvest step.

What APY should I expect? Whatever the venues pay, weighted by allocation, net of the ten percent performance fee. The dashboard shows the vault's live blended rate. Anyone quoting a fixed number for a product that supplies to floating-rate lending markets is quoting a marketing figure.

Why not just put everything in the highest-paying pool? Two reasons. A headline rate says nothing about surviving your arrival — supplying capital lowers utilization, which lowers the rate you actually receive. And concentration turns a single venue's bad day into a total loss. Splitting keeps each position on a steeper part of its own yield curve, so diversification here raises expected return rather than costing it.

Deposits and withdrawals

Why does depositing take two transactions? The first approves the vault to move your USDG; the second deposits. Subsequent deposits within the approved amount need only one.

Why is my deposit not earning immediately? It waits in the idle buffer until the next batch deploys. Batching is what makes entry gas cheap for small deposits. The wait is usually short.

Can a withdrawal fail? Yes, if you ask for more than the vault can pay right now — lending venues can be temporarily illiquid. It fails cleanly: the transaction reverts and your shares are untouched. The app shows the available figure before you type an amount, so this should not surprise you.

Why is available capacity lower than TVL? Because capacity counts only cash the venues could hand over right now. Balances lent out to borrowers are excluded until a borrower repays.

Is there a lock-up or withdrawal fee? No, and no.

Fees

How much and on what? Ten percent, on yield only, capped in code at thirty percent.

What is a high-water mark? The highest share price the vault has reached. Fees only apply above it, so after a drawdown you are not charged again until the previous peak is passed. The same gain is never charged twice.

Can the fee touch my principal? No. The mark only ever ratchets upward, including in the edge case where the fee rounds to zero shares — a case fuzzing caught and the code now handles explicitly.

Do I pay for gains that happened before I deposited? No. Fees accrue before every deposit, so you buy in at a price that already reflects them.

Risk

What are the actual risks? A venue could fail; the vault's own contracts are a target; the allocation model could misjudge; the keeper could stall or be compromised. Each is bounded by something in the contract — weight ceilings, a small unchanging core, cooldowns and profitability gates, and a keeper whose authority is timing rather than direction. Security covers all of it.

Has it been audited? Not yet, and that is stated plainly rather than buried. The contracts carry sixty-three tests across unit, fuzz and invariant suites, and the engineering notes are maintained as the package an auditor starts from. An audit is a prerequisite for mainnet, not a nice-to-have.

Can the team rug? The owner can pause deposits, change parameters within coded bounds, and pull capital from a venue back to the idle buffer. Withdrawals stay open while paused. The owner cannot transfer depositor assets out. Adapters are the real trust surface: a malicious adapter could steal what was deployed to it, which is why registration is owner-only and why no venue may exceed forty percent.

What happens if the keeper stops? Yield degrades — capital sits idle and weights drift — but nothing is lost, and you can still withdraw. Withdrawals never depend on the keeper.

Technical

Is mUSDG transferable? Yes. It is a standard ERC-20 and ERC-4626 share, twelve decimals.

Why twelve decimals? Six from USDG plus a six-decimal offset. It keeps round-trip rounding loss around one wei and makes the classic ERC-4626 inflation attack uneconomic.

Does share price only go up? Almost. Venues round a supplier's burn up, so unwinding one to serve a withdrawal costs up to a wei per venue touched. It is dust, it is bounded, and it is measured in the invariant suite rather than glossed over.

Can other protocols use my position as collateral? That is the intent of using a standard share token, and it is on the roadmap rather than live today.

Where is the code? The contracts, the keeper and this site live in one repository. The whitepaper has the full technical treatment.